Final answer:
The average kinetic energy of the H2O(l) molecules decreases as the temperature A) decreases, in accordance with the kinetic theory.
Step-by-step explanation:
As the temperature of a sample of H2O(l) decreases, the average kinetic energy of its molecules will decrease. The kinetic energy of the molecules in a substance is directly related to the temperature: as temperature decreases, the molecules move more slowly and as a result, their kinetic energy decreases. This concept is in accordance with the kinetic theory of gases, which applies to liquids as well when considering the movement of particles.